Overlay Transport Virtualization （OTV） provides an overlay that enables Layer 2 connectivity between separate Layer 2 domains， while keeping these domains independent and preserving the fault isolation， resiliency， and load-balancing benefits of an IP-based interconnection. Which statements are true about OTV Adjacency Server？（） [" Adjacency Server is required when OTV is deployed with unicast-only transport."," Adjacency Server is required when OTV is deployed with multicast-enabled transport."," Each OTV device wishing to join a specific OTV logical overlay needs to first register with the Adjacency Server."," Each OTV device trying to join a specific OTV logical overlay needs to be configured as an Adjacency Server."]
始发作业四门检查了望，入车厢，开启厕所，清理门头标准：按照出场门、同侧对门、另端两侧门，做到四门不漏锁，了望认真，无旅客抓车、挂车，确保安全，厕所开启及时，门头无旅客行李包裹。
外显记忆
What are the header sizes for point-to-point and multi-point GRE（also known asmGRE） with tunnel key？（） [" 4 bytes for both"," 4 bytes， and 8 bytes respectively"," 8 bytes for both"," 24 bytes for both"]
下面说法不正确的是（） ["上10波业务时WBA（+5dB型）的输入功率大小是-8dBm","上8波业务时WPA（单波输入功率-28dBm）的输入功率应该是-19dBm","OptiXBWS320G子架最多可提供的公务电话数量是3个","OptiXBWS320G设备采用的波长间隔约是0.08nm"]
一般毒性试验对受试生物的选择需要哪些条件？
